PCA9535HFHP

I/o Expanders Overview

The PCA9535HFHP is a 24-pin CMOS device providing 16 bits of General Purpose parallel Input/Output (GPIO) expansion for I2C-bus/SMBus applications. It operates within an operating power supply voltage range of 2.3 V to 5.5 V and supports a clock frequency from 0 Hz to 400 kHz. The device features 5 V tolerant I/Os, an active LOW interrupt output, and low standby current. It includes noise filters on SCL/SDA inputs and internal power-on reset functionality. ESD protection exceeds 2000 V HBM per JESD22-A114. The HWQFN24 package measures 4 x 4 x 0.75 mm.

I/o Expanders Feature Summary

• Provides 16-bit GPIO expansion with individual I/O configuration capabilities
• Features polarity inversion registers for flexible logic level handling
• Includes open-drain interrupt output activated by input state changes
• Offers enhanced drive capability and lower supply current compared to predecessors

I/o Expanders Applications

• ACPI power switches
• Sensor interfaces
• Push button scanning
• LED control systems
• Fan monitoring circuits

I/o Expanders Procurement Notes

Verify the specific ordering suffix HP indicates the HWQFN24 package variant with Reel 13" Q2/T3 packing method. Confirm the component status as it may be subject to obsolescence notices. Ensure the supplier provides valid traceability documentation matching NXP Semiconductors specifications before finalizing acquisition.

I/o Expanders Selection Notes

Select this part when a low-power I2C expander with interrupt capability is required in a compact surface-mount form factor. Choose the HFHP variant specifically for its HWQFN24 packaging requirements. Consider the PCA9535C if high-impedance open-drain outputs are strictly necessary instead of the standard totem-pole outputs found in the base PCA9535 model.

I/o Expanders Part Context

This component belongs to the PCA9535 series developed to enhance NXP's I2C bus I/O expander family. It is functionally identical to the PCA9555 but lacks internal I/O pull-up resistors, which significantly reduces power consumption when I/Os are held LOW. It shares pin-to-pin and address compatibility with PCF8575 devices, though software adjustments are required due to architectural enhancements.

I/o Expanders Replacement Considerations

PCA9535HF,118 serves as a direct package-compatible alternative within the same series.